package com.atguigu.gulimall.product.service.impl;

import com.sun.xml.internal.bind.v2.TODO;
import org.springframework.stereotype.Service;

import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listTree() {
        List<CategoryEntity> entities = baseMapper.selectList(null);

        List<CategoryEntity> tree = entities.stream()
                .filter(categoryEntity -> categoryEntity.getParentCid() == 0)
                .map(categoryEntity -> {
                    categoryEntity.setChildren(getChildren(categoryEntity,entities));
                    return categoryEntity;
                })
                .sorted(Comparator.comparingInt(entity -> (entity.getSort() == null ? 0 : entity.getSort())))
                .collect(Collectors.toList());

        return tree;
    }

    /**
     * 递归查找子分类
     * @param root
     * @param all
     * @return
     */
    private List<CategoryEntity> getChildren(CategoryEntity root, List<CategoryEntity> all) {

        List<CategoryEntity> children = all.stream()
                .filter(categoryEntity -> categoryEntity.getParentCid().equals(root.getCatId()))
                .map(categoryEntity -> {
                    categoryEntity.setChildren(getChildren(categoryEntity, all));
                    return categoryEntity;
                })
                .sorted(Comparator.comparingInt(entity -> (entity.getSort() == null ? 0 : entity.getSort())))
                .collect(Collectors.toList());

        return children;
    }


    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 1、判断是否满足删除条件


        //2、删除
        baseMapper.deleteBatchIds(asList);
    }
}
